Zero invites twelve NASCAR drivers to the White House for a photo op, with only a week's prior notice. The drivers all have prior commitments, because they are busy guys this time of year. Zero has nothing else to do that Wednesday, because that is the day he wanted to read his jobs speech to a joint session of congress and Boehner said, "No, we're kind of busy that day. How about Thursday, as long as you finish before the football game starts?"
The real story here should be "Eight NASCAR drivers manage to clear time in their busy schedules for meeting at White House", not "Four don't".